Investment in Real Estate - Real Estate Acquired (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets acquired
Assets acquired	$ 142,374	$ 120,448	$ 23,900
Other assets	0	20	53
Total assets acquired	142,374	120,468	23,953
Liabilities assumed
Mortgage notes payable	5,900	22,010	0
Other liabilities	32	2,214	266
Total liabilities assumed	5,932	24,224	266
Net assets acquired	136,442	96,244	23,687
Land
Assets acquired
Assets acquired	57,278	60,489	8,985
Buildings and other depreciable property
Assets acquired
Assets acquired	85,096	55,445	13,948
Manufactured homes
Assets acquired
Assets acquired	0	67	345
In-place leases
Assets acquired
Assets acquired	$ 0	$ 4,447	$ 622